Hi 👋, I’m Nitish Prasad Kushwaha, a Software Engineering Lead - SDE3 at Optum (UnitedHealth Group) with 4+ years of industry experience building scalable backend systems and production-grade applications. I specialise in Java, Spring Boot, Microservices, System Design, REST APIs, JWT/OAuth2 security, and performance optimisation. I’ve designed and developed 50+ APIs, worked on real-world production issues, and actively mentored juniors and peers. I’ve also cleared competitive programming challenges like HackWithInfy, TCS CodeVita, and have solved 2000+ DSA problems across platforms like LeetCode, CodeChef, and GFG. If you’re preparing for backend interviews, system design rounds, or want career guidance from an industry engineer, I’d be happy to help